JPH06339607A - Filter and its preparation - Google Patents

Abstract

PURPOSE:To make a filter compact and with a large filter area and to improve remarkably filtering performance. CONSTITUTION:A raw material such as a metal net and a non-woven fabric made of a metal is bent by means of a roller etc., into a zigzag cross-section and a part thereof is pressed down into a flat shape by means of a press to form a flange 2. As the raw material does not deform extensibly, the distance between adjoining crest line 3a and valley 3b on an uneven part 3 can be made small and the height of the uneven part can be made high to make it accordingly possible to increase the filter area and, furthermore, as the mesh size can be uniformly kept approximately over the whole area of the uneven part 3, the filtering performance can be remarkably improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter body which is attached to a fluid pipe or the like by flange connection and a method for manufacturing the same.

[0002]

2. Description of the Related Art A wire mesh filter which is attached to a fluid conduit for liquid or gas by flange connection is generally formed of a wire mesh or a metal non-woven fabric. Conventionally, as shown in FIG. Further, the hemispherical projection 22 is formed inside the flange 21 provided on the outer periphery, that is, the filter body 20 is formed in a hat shape, thereby increasing the filtration area.

As shown in FIG. 17, the wire mesh filter body 20 is formed with hemispherical projections 23a while the strip-shaped material wire mesh A is intermittently transferred along the longitudinal direction. The male wire punch 23 and the female metal punch 24 having the hemispherical recess 24a are pressed from both sides of the material wire mesh A to form the protrusions 22. Then, the portion around the protrusions 22 is filtered. It is manufactured through a process of punching from the material wire mesh A with a punching punch (not shown) having the same outer diameter as 20.

[0004]

However, in the structure in which the hemispherical projection 22 is simply formed on the inside of the flange 21 as described above, in order to further increase the filtration area,
Since the height of the protrusion 22 must be increased,
There is a problem that the filter body 20 is bulky and is inefficient in transportation and storage.

In the conventional manufacturing method in which the projection 22 is bulged by pinching the material wire net A such as a wire net or a non-woven cloth with the pair of punches 23 and 24, the amount of elongation deformation of the material wire net A is limited. Therefore, it is practically impossible to significantly increase the filtration area because the height of the protrusions 22 cannot be increased to a certain level or higher. 1: 1 ratio of height to diameter
Cannot be made larger, and in the case of a non-woven fabric, the ratio becomes smaller).

In addition, in the conventional manufacturing method, since the projections 22 are formed by stretching and deforming the raw material wire net A, the roughness of the projections 22 is larger than that of the raw material wire mesh A. In addition to increasing the size, the elongation deformation of the material wire mesh A is not necessarily uniform in each part of the protrusion 22.
There was also a problem in that the coarseness of the meshes in each of the areas 2 became non-uniform and the filtration performance was significantly reduced.

A first object of the present invention is to provide a filter body which is compact and has a large filtration area, and a second object thereof is to increase the filtration area and remarkably improve the filtration performance. An object of the present invention is to provide a method capable of inexpensively producing an improved filter body.

[0008]

In order to achieve the first object of the present invention, according to the present invention, as described in claim 1, a flat plate-like flange is formed on the outer periphery, and a ridge and a valley are formed inside the flange. The uneven portion formed in a zigzag cross section so as to extend substantially in parallel is formed so as to project in both the front and back directions or the front and back directions of the flange.

In order to achieve the second object, as described in claim 2, a plastically deformable material such as a wire mesh or a metallic non-woven fabric is bent into a zigzag cross section by a roller pair or the like, and then, A manufacturing method was adopted in which a flange was formed by flatly crushing part of the material.

[0010]

When the uneven portion having a zigzag cross section is formed on the inside of the flange as in claim 1, the distance between the ridge line and the valley in the uneven portion is narrowed to thereby extend from the valley bottom to the ridge line in the uneven portion. Since the surface area of the filter body can be increased more than before in the state where the height is lower than the height of the conventional hemispherical protrusion, the filtration area can be remarkably increased as compared with the conventional one.

Therefore, according to the present invention, since the filter body can be made compact under the condition that the filtration area is increased as compared with the conventional one, there is an effect that the efficiency of transportation and storage of the filter body can be improved. On the other hand, the manufacturing method of the present invention forms an uneven portion by bending a material such as a wire mesh or a metal non-woven fabric, and since the material does not stretch and deform when forming the uneven portion, the adjacent portions in the uneven portion are adjacent to each other. It is possible to reduce the interval between ridges or valleys and increase the height of the uneven portion. Therefore, even though it is a filter body formed of a plastically deformable material such as a wire mesh or a metal non-woven fabric, the filtration area can be increased. It can be increased even more.

Further, since the uneven portion can be formed without stretching and deforming the material, the roughness of the uneven portion is kept the same as that of the material, and the unevenness is uniform over substantially the entire area of the uneven portion. Therefore, the filtration performance can be remarkably improved. In addition, it is possible to use inexpensive materials such as wire mesh and metallic non-woven fabric as a material, and to bend the material in a zigzag cross section, using a roller or the like is extremely easy, and in a zigzag shape. It is a filter body that can increase the filtration area and improve the filtration performance by the synergistic effect of the three things that the flange can be crushed and formed on the bent material easily by using a press device, but it is inexpensive. It also has the effect that it can be manufactured.

[0013]

Embodiments of the present invention will now be described with reference to the drawings (FIGS. 1 to 16).
It will be described based on. 1 to 5 show a first embodiment relating to a filter body, and in these drawings, reference numeral 1 denotes a wire mesh filter body formed in a circular shape in plan view.
Is composed of a ring-shaped flange 2 formed on the outer circumference, and a concavo-convex portion 3 having a zigzag cross-section formed integrally inside the flange 2.

The uneven portion 3 is formed so that its ridge line 3a and valley 3b extend substantially parallel to each other in plan view, and the ridge line 3a projects toward the surface of the flange 2 to form a valley 3b.
Are projected toward the rear surface of the flange 2. It should be noted that wrinkles 4 are formed at the ends of the ridgeline 3a and the valley 3b of the flange 2 due to crushing during the manufacturing process, as will be described later in detail.

In the above-mentioned filter body 1, for example, as shown in FIG. 5, a sealing edge member 5 is fitted on a flange 2 and is sandwiched by flange portions 6a of two pipes 6. It is inserted in the middle of the pipe line by a flange joint in which it is sandwiched between the flange portions 6a of both pipes 6 and 6 by fastening with a joint 7 or fastening with a bolt. Therefore, in the present invention, as is clear from FIG. 5, as compared with the case where the height dimension of the uneven portion 3 is formed to be the same as the height of the simple hemispherical protrusion 22, the length of the cross section of the uneven portion 3 is the protrusion. Since the length of the cross section of 22 is always longer, the filtration area can be increased as compared with the conventional case even if the height of the uneven portion 3 is the same as the height of the protrusion 22, and the ridge line 3a in the uneven portion 3 is By narrowing the interval with the valley 3b, the filtration area can be significantly increased.

In the above-mentioned embodiment, the filter body 1 is formed of the metal mesh, but the filter body 1 according to the present invention is, for example, as shown in FIG.
Needless to say, it can be formed of various porous materials, such as a metal non-woven fabric as shown in
Not only a single layer such as a wire mesh or a non-woven fabric, but also a multi-layer structure of the same kind of material or different kinds of material may be used. In addition, as illustrated in FIGS. 7 to 9, the ridgeline 3 a in the uneven portion 3 is used.
It goes without saying that the number of threads of the valleys 3b and the outer shape of the filter body 1 can be appropriately set according to the size of the filter body 1, the cross-sectional shape of the conduit, and the like.

FIGS. 10 to 14 are views showing a second embodiment suitable for manufacturing the filter body 1 shown in FIGS. 1 to 9 and, in this embodiment, shown in FIG. The wire mesh filter 1 having the different form will be described. That is, the pitch P of the unevenness is provided on the transfer path for transferring the material web A of the strip.
The pair of upper and lower first rollers 8 and 8 in which 1 is larger than the pitch P of the unevenness of the uneven portion 3 in the filter body 1, and the pitch P2 of the unevenness is the pitch P of the unevenness of the uneven portion 3 in the filter body 1.
A second roller pair 9, 9 having the same size as that of the first roller pair 8, 8 is arranged on the upstream side, and the material wire net A is sandwiched by each roller pair 8, 9. Then, the pair of rollers 8 and 9 are rotationally driven.

Then, the material wire mesh A is bent in a zigzag shape to about half the depth of the uneven portion 3 by the first roller pair 8 and 8 so that the width thereof is further narrowed. Meanwhile, the second roller pair 9 and 9 are bent in a zigzag shape having the same depth as the concave and convex portion 3 of the filter body 1. Then, the material wire net A bent in a zigzag shape is shown in FIG.
As shown in FIG. 14, a pair of upper and lower pressing bodies 10 and 11 formed in a cylindrical shape having an outer diameter slightly larger than that of the filter body 1 presses the material wire mesh A from both front and back sides, and the material is bent in a zigzag shape. A flange 2 is formed by crushing a part of the wire mesh A into a ring shape in plan view, and then a ring-shaped punching punch 12 having the same outer diameter as the filter body 1 and a receiving die 1 are formed.
With 3, the parts of the flange 2 are punched out from the material wire mesh A, and the filter body 1 is obtained.

In this manner, the material wire mesh A is bent in a zigzag cross section while narrowing its width, thereby forming the uneven portion 3
Since the material wire mesh A does not expand and deform, the gap between the adjacent ridge lines 3a and valleys 3b in the uneven portion 3 can be reduced and the uneven portion can be formed even though the filter body 1 is made of wire mesh. The height of 3 can be increased, and the filtration area can be significantly increased.

Moreover, since the roughness of the uneven portion 3 is uniform in almost all parts and is kept the same as the roughness of the material wire net A, the filtration performance can be remarkably improved. In the above example, the material wire net A was bent in a zigzag shape in two steps by using two pairs of rollers 8 and 9, but when the depth of the uneven portion 3 is shallow, one step is required. It may be bent with, or if the depth of the uneven portion 3 is deep,
It is also possible to gradually bend in three or more steps. Further, the step of bending the material wire mesh A in a zigzag shape and the step of forming the flange do not necessarily have to be continuously performed.

When the diameter of the filter body 1 is small,
The unevenness of each roller pair 8 and 9 is formed continuously in the axial direction, and a plurality of pressing bodies 10 and 11, punching punches 12 and receiving dies 13 are provided along the width direction of the material wire net A, A plurality of filter bodies 1 may be taken by feeding the wire net A in one pitch. On the other hand, when the filter body 1 is large, a material such as a wire mesh or a non-woven fabric is cut into each area required for each filter body 1 and is bent into a zigzag cross section by an appropriate means to form the uneven portion 3 It is also possible to form the flange 2 by forming the concave portion 3 and then flattening the portions at both ends of the concave-convex portion 3 with a pair of pressing bodies.

The uneven portion 3 may be formed so as to project in only one of the front and back directions of the flange 2. However, if it is formed so as to project in both the front and back directions of the flange 2 as in the above-mentioned embodiments, When a part of the material such as the material wire mesh A formed in the zigzag shape is flatly crushed to form the flange 2, the crushing amount can be half the height dimension of the concave-convex portion 3. There is an advantage that the protrusion height of the concave-convex portion 3 can be increased without causing breakage at the portion of the portion.

When flattening the portions at both ends of the uneven portion 3, only the bending force and the compressive force mainly act on the material, so that the uneven portion 3 is projected only in one direction of the flange 2. However, the breakage at the both ends of the uneven portion 3 hardly occurs. In the above embodiment, the material wire mesh A is bent in a zigzag shape by the roller pairs 8 and 9 having an uneven cross section, but as shown in FIG. 15, a pair of gears 14 and 14 that mesh with each other. It is also possible to fold it in a zigzag shape by other means such as bending it through the material A'between.

FIG. 16 shows the flange 2 of the filter body 1.
It is another embodiment of the edge member 5 attached to the
With the pair of upper and lower synthetic resin ring bodies 15, 15 stacked on the front and back surfaces of the flange 2, the synthetic resin ring bodies 15, 15 are pressed by the pair of upper and lower heating plates 17, 17.
The edge member 5 is formed by fusing the two ring bodies 15 and 15 in a plate shape.

By doing so, even if the thickness of the flange 2 is uneven along the circumferential direction due to the flattening of both ends of the uneven portion 3, the edge member 5 has a uniform thickness. It is possible to secure the sealing function.

[Brief description of drawings]

FIG. 1 is a perspective view from the surface direction of a filter body according to a first embodiment.

FIG. 2 is a perspective view of the filter body of FIG. 1 turned upside down.

FIG. 3 is a plan view of FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

5 is a cross-sectional view taken along line VV of FIG. 3 in a state where the pipe is attached to a conduit.

FIG. 6 is a perspective view showing a modification of the first embodiment.

FIG. 7 is a perspective view showing another modification of the first embodiment.

FIG. 8 is a perspective view showing another modification of the first embodiment.

FIG. 9 is a perspective view showing another modification of the first embodiment.

FIG. 10 is a plan view showing a second embodiment of the manufacturing method.

11 is a sectional view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII of FIG.

FIG. 13 is a plan view showing the steps of crushing and punching.

FIG. 14 is a side view taken along line XIV-XIV of FIG. 13.

FIG. 15 is a diagram showing another embodiment.

FIG. 16 is a diagram showing another embodiment.

FIG. 17 is a diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter body 2 Flange 3 Uneven portion 3a Ridge line 3b Valley 5 Edge member 6 Pipe 8,9 Bending roller 10,11 Pressing body 12 Punching punch 13 Receiving die 14 Bending gear A Material mesh

Claims (2)

[Claims] 1. A flat plate-shaped flange is formed on the outer periphery, and an uneven portion formed in a zigzag cross section so that a ridge line and a valley extend substantially parallel to each other is formed inside the flange in either the front or back direction or the front or back direction. The filter body is formed so as to project in the direction of. 2. A flange is formed by bending a plastically deformable material such as a wire mesh or a metallic non-woven fabric into a zigzag cross section with a roller pair or the like, and then flatly crushing a part of the material. A method for producing a filter body.